/Engine/Source/Runtime/Core/Public/String/Join.h
Create an object that can be appended to a string builder to append every element of the range to the builder, separating the elements by the delimiter.
An anonymous object to append to a string builder.
namespace UE { namespace String { template<typename RangeType, typename DelimiterType> auto UE::String::Join ( RangeType && Range, DelimiterType && Delimiter ) } }